I like how Taylor Swift refers to lyrics and music that other people wrote for her to perform as hers. They're the ones that deserve the credit, not her.
Sure, her recent album had collaborations with known producers, but I can assure you most of her content is self-written. Her entire third album (which many fans consider her best, myself included) was written by herself - no co-writers - and produced by herself and Nathan Chapman of Big Machine Records.
Please look up the songwriting credits of her discography before making these statements. They are public domain.